In species and structural properties of In-exchanged ZSM5 an Mordenite

JUAN M. ZAMARO; EDUARDO E. MIRÓ; MALCOLM YATES; ANGEL MARTÍNEZ; GUSTAVO FUENTES

Edimburgh, Scotland

Simposio; 8th International Symposium on the Characterisation of Porous Solids; 2008

The University of Edimburgh

Nitrogen oxides (NOx) produced in the combustion processes of internal combustion engines in either stationary (e.g. energy plants) or mobile sources (e.g. automobiles) are major atmospheric pollutants. For over a decade now, zeolites have been studied as catalysts for the Selective Catalytic Reduction (SCR) of NOx to produce innocuous N2, indium-zeolites being possible candidates. Even though the catalytic behavior of these solids has been extensively studied, further research is needed to define the nature of the indium species and their relationship with the catalytic performance. Different methods have been developed to add indium to zeolites, where the method selected determines the type of indium species generated.             In this work we studied In-mordenite and In-ZSM5 exchanged samples produced through high-temperature treatments of In(NO3)3 impregnated solids. The indium-zeolites were characterised through Fourier Transform Infrared Spectroscopy (FTIR), Si and Al Magic Angle Nuclear Magnetic Resonance Spectroscopy (Si29MASNMR and Al27MASNMR), NO Temperature Programmed Desorption (NO-TPD), Thermogravimetric Analysis and Differential Thermal Analysis (TGA-DTA) techniques.